Apply local configuration to install targets

The target of `cabal install` is not considered to be a local package,
which means local configuration (e.g. in cabal.project, or flags like
--enable-profiling) does not apply to it.

In 76670ebd, we changed the behaviour to
applying the local flags to cabal install targets, but it used the
literal target string as a package name to which the flags were
additionally applied.

However, `cabal install` targets are NOT necessarily package names, so,
e.g., if we did `cabal install exe:mycomp`, the local flags would not
apply since "exe:mycomp" is not a recognized /package/.

The solution is to parse the target selectors first, and apply the local
flags to the package of the resolved targets.

Fixes #7297, #8909, the install part of #7236, #8529, #7832